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양산시 하수관거의 불명수 산정을 위한 유량 및 수질특성
최호은,김한석,정연화,김대용,성낙창 東亞大學校 建設技術硏究所 2008 硏究論文集 Vol.31 No.2
The objective of this study were to investigated the water quantity and quality characteristics of sewer infiltration/inflow(I/I) computation in Yangsan City. infiltration/inflow(I/I) were evaluated the water-use evaluation, average daily minimum flow-water quality evaluation and minimum daily flow evaluation. Flow meter for infiltration/inflow(I/I) evaluation was used the FLO-TOTE II. Contaminant came into very low concentration at all sampling points as BOD5 standard. Also, I/I evaluation during dry weather on maximum daily infiltration flow-water quality evaluation, maximum-minimum daily flow evaluation, average daily-minimum flow-water quality evaluation is desirable than water-use evaluation. Because that infiltration/inflow(I/I) amount is much different than other evaluation methods.
초음파의 음향밀도에 따른 디젤오염토양의 TPH 분해특성에 관한 연구
최호은 ( Ho-eun Choi ),정연화 ( Yon-hwa Jung ),김한석 ( Han-suk Kim ),김대용 ( Dae-yong Kim ),정병길 ( Byung-gil Jung ) 한국환경기술학회 2007 한국환경기술학회지 Vol.8 No.4
본 연구에서는 초음파 음향밀도에 따른 디젤오염토양의 TPH의 분해특성을 평가하고자 하였다. 실험은 토양 1 kg에 디젤을 주입하여 TPH 농도를 약 10,000 mg THP/kg soil로 오염시켜 사용하였다. 초음파 조사 후 토양 중에 남아 있는 TPH 농도를 GC를 이용하여 분석하였다. 실험결과 초음파의 조사강도가 클수록, 오염토양의 양이 많을수록 TPH 농도 감소가 크게 나타났다. 또한 디젤오염 토양에 대하여 초음파를 60분간 조사시 TPH 농도변화는 음향밀도 50 W/L의 경우 9,556 mg TPH/kg soil에서 1,254 mg TPH/kg soil로 감소하였고, 음향밀도 70 W/L의 경우 9,856 mg TPH/kg soil에서 965 mg TPH/kg soil로 음향밀도 90 W/L의 경우 9,532 mg TPH/kg soil에서 733 mg TPH/kg soil로 각각 감소하는 것으로 나타났다. 디젤오염토양에 대한 초음파 조사시 TPH 제거효율은 음향밀도 90 W/L와 토양과 물의 혼합비율을 5:5로 하였을 경우 가장 높은 92.3%를 나타내었다. The objective of this study was to evaluate the degradation characteristics of the total petroleum hydrocarbons (TPHs) from artificially diesel-contaminated soil by means of the ultrasound acoustic density. The experiments were carried out with diesel fuel. A total of 1 kg of soil was artificially contaminated by approximately 10,000 mg of TPHs. The amounts of remaining TPHs in the treated soil were analyzed using a gas chromatography (GC).The removal efficiency of TPHs in the soil increased when the higher ultrasound intensity and the larger amounts of contaminated soil were used. In addition, the degrees of the degradation were carried out at constant ultrasound time of 60 min with different an acoustic densities. The most significant information of these were the following: 9,556 mg TPH/kg soil was decreased up to 1,254 mg TPH/kg soil at an acoustic density of 50 W/L. 9,856 mg TPH/kg soil was decreased up to 965 mg TPH/kg soil at an acoustic density of 70 W/L. 9,532 mg TPH/kg soil was decreased up to 733 mg TPH/kg soil at an acoustic density of 90 W/L. The result of this study showed that the highest removal efficiency (92.3%) of TPH in the soil was observed when an acoustic density of 90 W/L, and at a 5:5 soil to water ratio (w/w) were applied in this research.
유류오염토양 처리를 위한 마이크로나노버블 토양세척에 관한 연구
최호은 ( Ho Eun Choi ),정진희 ( Jin Hee Jung ),한영립 ( Young Rip Han ),김대용 ( Dae Yong Kim ),정병길 ( Byung Gil Jung ),최영익 ( Young Ik Choi ) 한국환경과학회 2011 한국환경과학회지 Vol.20 No.10
The objectives of this study are to examine the processing of oils contamination soil by means of using a micronano- bubble soil washing system, to investigate the various factors such as washing periods, the amount of micro- nano bubbles generated depending on the quantity of acid injection and quantity of air injection, to examine the features involved in the elimination of total petroleum hydrocarbons (TPHs) contained in the soil, and thus to evaluate the possibility of practical application on the field for the economic feasibility. The oils contaminated soil used in this study was collected from the 0~15 cm surface layer of an automobile junkyard located in U City. The collected soil was air-dried for 24 hours, and then the large particles and other substances contained in the soil were eliminated and filtered through sieve No.10 (2 mm) to secure consistency in the samples. The TPH concentration of the contaminated soil was found to be 4,914~5,998 mg/kg. The micronano-bubble soil washing system consists of the reactor, the flow equalization tank, the micronano- bubble generator, the pump and the strainer, and was manufactured with stainless material for withstanding acidic phase. When the injected air flow rate was fixed at 2 L/min, for each hydrogen peroxide concentrations (5, 10, 15%) the removal percents for TPH within the contaminated soil with retention times of 30 minutes were respectively identified as 4,931 mg/kg (18.9%), 4,678 mg/kg (18.9%) and, 4,513 mg/kg (17.7%). And when the injected air flow rate was fixed at 2 L/min, for each hydrogen peroxide concentrations (5, 10, 15%) the removal percents for TPH within the contaminated soil with retention times of 120 minutes were respectively identified as4,256 mg/kg (22.3%), 4,621 mg/kg (19.7%) and 4,268 mg/kg (25.9%).